Default [Q] problem when copying files from pc to device

hello,

i have a problem when i copy files via usb cable from my pc to my device.

it only occurs if the files are a little larger. i use a custom rom on my g2 and if i want to copy the new version of the rom to my device (181 mb) copying stops just before the end and i have to cancel. Then i have to reconnect my g2. After that i copy the rom zip again and its successfully.
but if i copy gapps (83 mb) its directly copied successfully.

i have the problem on now two custom roms and the problem was not always there only for some time.
and i have tried it with usb debugging enabled and disabled... same problem.

any suggestions to solve the problem?
sorry for my strange english

current device: LG G3 [D855]

sold, lost or broken devices:
 
  • lg g2
  • lg g pad 8.3
  • nexus 7 2013 lte
  • sony xperia z
  • asus transformer pad
  • sony xerpia s
  • apple ipad 2
  • apple iphone 4s
  • apple iphone 4
  • sony ericsson satio
  • sony ericsson c902
  • samsung sgh u700
  • nokia n73
  • nokia 7610
  • sagem my x5-2
  • siemens s55
  • nokia 6310
  • nokia 3310
  • alcatel one touch easy